Coal-chute



j 3 Sheets-Sheet 1i '0 CROSBY. GOAL GHUTE (No Model.)

*No. 599,769.. Patented Mar. 1, 1898.

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Q INVENTOR BY W r WITNESSES I ATTORNEY (No Model;) 3 Sheets-Shet 2.

0'. CROSBY. IGOAL GHUTB.

No. 599,769; PaJtentedMar. 1 898.

WITNESSES: INVENT OR I [ATTORNEY a: NORRIS PEI-Ens co, PNQ MJYHQ.WASNINGTON, n. c.

3 mm S O R C A Patented M21131, 1898.

INVENTOR WITNESSES:

ATTORNEY I UNITED ST TES PATENT OFFICE.

OLIVER CROSBY, OF' ST. PAUL, MINNESOTA.

COAL-CHUTE.

S1EGIFIOATI ON forming part of Letters Patent No. 599,769, dated March1, 1898.

Application filed May 28, 1396.

To all whom it may concern:

Be it known that I, OLIVER ORosBY, of St. Paul, Ramsey county,Minnesota, have invented certain Improvements in Coal-Chutes, ofwhich'the following is a specification.

My invention relates to improvements in counterbalanced coal-chutes; andit consists Fig. 3 is a detail end elevation of the same.

Fig. 4 is a partial detail of the counterbalancing-weight cable-drum andattachments, and Fig. 5 is a perspective detail of the brakeoperatingmechanism. 7

My invention is designed to provide automatic means for stopping theoperation of the apparatus in case the hoisting-cable of the chuteshould break, thereby preventing injury to the operator or to theapparatus,

. and whereby also the apparatus maybe mechanically stopped Whenevernecessary for the purpose of repair or otherwise.

In the drawings, A represents the frame to which the coal-chute 2 isconnected by the hinge 3. I 7 7 4 is a chute-hoisting rope or cable; 5,the spirally-grooved winding-drum for the cable; 6, its drivin g-gear; 7,the pinion meshing therewith, mounted upon the shaft 8, operative bymeans of the crank 9. Fixed upon the shaft 10, which carries the drum 5,is the similar spirally-grooved drum 11 for the cable 12, which supportsthe c0unterweight'13, running, as shown, over the sheaves 14 and 15 inthe ordinary way. Also mounted upon the shaft 10 is the friction-drum16, provided with a circumferential V-shaped groove 17. Un-

dern'eath this drum is arranged the wedgeshaped friction-block 18,fitted to the groove 17 and adapted to be thrust therein to stop therotation of the drum and its connected shaft and the drums 5 and 11.This block is carried by the cross-head 19, working on the guides 20 andhaving a projection or boss 21,

seen No. 593,445. (No model.)

which rides upon the periphery of the cams 22, and, according to theposition of the cams, is held in engagement with the drum 16 or isallowed to drop out of its groove and release the same. The cams 22 aremounted upon the rock-shaft 23, operative by means of the hand-lever 24,which is normally held in the position shown in Fig. 2 by thecounterweighted arm 25, in which position the recessed portion 26 of thecams 22 stands contiguous to the boss 21, allowing the block 18 to dropout of engagement with the drum 16. The rock-shaft 23 is held normallyin this position by means of the arm 27, depending from the rock-shaft28, normally held in substantially vertical position by means of theweighted arm 29 upon the shaft 28. In this position the arm 27 engagesthe spur 30, fixed to the shaft 23, and prevents turning of the shaft 23under the impulse of its Weighted arm 25, the lever 24 standing inmid-position, as indicated by full lines in Fig. 2 and by dotted linesin Fig. 4. When the shaft 28 is rocked, so as to disengage the arm 27from the spur 30, the Weighted arm 25 serves to turn the shaft 23 andturn the cams, so as to lift the block'19 and carry the Wedge 18 intoengagement with the drum 16, so as to automatically stop its rotation,as hereinafter described, the lever 24 standing in the extremedotted-line position shown in Fig. 4. When it is desired to stop thedrum 16 and its shaft 10 mechanically, the lever 24 is thrown over inthe opposite direction into the position shown in full lines in Fig. 4,whereby the cams 22 are oppositely turned, so as to lift the wedge 18into engagement with the drum 16 to stop the apparatus.

In order to automatically stop the apparatus in case either thechute-hoisting cable or the counterweight-supporting cable should break,thereby endangering the lives of the operators at the cranks, I providethe following-described attachments for releasing the rock-shaft 23, soas to throw the wedge 18 into engagement with the drum 16.

The bails B and O are hung to freely turn or swing out the shaft 10, thebail B inclosing the counterweight-supporting drum 11 and the bail O thechute-hoisting drum 5. The bail B carries an antifriction-roll 31 equalin length to the drum 11, adapted to ride upon the cable 12. The bailalso carries a laterally-projecting spur or arm 32, which, in case thecable 12 breaks, permitting the bail to drop into vertical position,will strike against the upwardly-projecting arm 33 upon the rock-shaft28, causing it to turn sufficiently to free the rock-shaft 23, whichthen turns and throws the wedge 18 into engagement with the drum 16.Similarly the bail O carries an antifriction-roll 34, riding upon thechute-supporting cable 4 and provided with a laterally-extending spur orarm 35, adapted similarly to engage the arm 36 upon the rock-shaft 28,whereby the breaking of the cable 4 will cause the stopping of theapparatus in the same manner as described in reference to the breakingof the cable 12.

It will thus be seen that by means of my improved attachment thechute-hoisting mechanism may be stopped at any time or in any positionmechanically, as desired, and is antomatically stopped in case of thebreaking of either cable, thereby preventing any injury to the operatorsor attendants from the destructive motion of the released part of themechanism or any injury to the apparatus itself.

I claim 1. The combination with a counterbalanced hoist of the classdescribed, of a brake therefor normally held out of engagementtherewith, and the automatic means for tripping said brake, restrainedby engagement with the hoisting and counterbalancing-weight cables whilethe same are under tension, but released so as to trip said brake by theslackening or breaking of either of said cables.

2. In an apparatus of the class described, the combination with thecommon drum-shaft, of the clutch or brake attachment therefor heldnormally out of engagement therewith, the swinging arms carryingidlerpulleys which ride normally upon the chute-hoisting andweight-supporting cables respectively, but which are adapted to trip orrelease said clutch or brake mechanism when allowed to swing out ofnormal position by the breaking of either cable.

3. In an apparatus of the class described, the combination with thedrum-shaft, of the friction-clutch attachment therefor, thecounterweighted rock-shaft for normally holding said clutch out ofengaging position,the bails hung loosely upon said drum-shaft andcarrying idler pulleys or rolls normally riding respectively upon thecables of said drums when under tension, said bails being each adaptedindependently in case of the breaking of its contiguous cable to tripsaid rockshat't, and throw said clutch into engagement with saiddrum-shaft.

4. In an apparatus of the class described, the combination with thecommon drum-shaft, of the grooved friction-drum mounted thereon, theshoe fitted to the groove in said drum, the counterweighted rockingcounter-shaft carrying cams for thrusting said shoe into engagement withsaid drum, the locking device for holding said counter-shaft with itscams out of engagement with said shoe, the idler roll or pulley ridingupon each of the cables connected to the drum shaft, and adapted, whenreleased by the breaking of its cable, to trip saidcounter-shaft-locking device, permitting it to turn so as to throw saidcams into engagement with said shoe, so as to stop the rotation of thedrum-shaft.

5. I11 an apparatus of the class described, the combination with theshaft, the drums secured thereon, and the hoisting andcounterbalancing-weight cables running respectively upon said drums, ofthe friction-drum also carried by said shaft, the brake therefor heldnormally out of engagement therewith, and the automatic means foroperating said brake, normally restrained by engagement with said cablesunder tension, and released so as to operate said brake by theslackening or breaking of either cable.

6. In an apparatus of the class described, the combination with thecommon dru m-shaft, of the spirally-grooved winding-drums, thechute-hoisting cable running upon one of said drums, and thecounterbalancing-weight cable running upon the other, the groovedfriction-drum also fixed upon said shaft, its shoe, the means fornormally holding said shoe out of engagement with said friction-drum,and the means for automatically throwing said shoe into engagement withsaid drum, normally held out of engagement therewith by said cableswhile under tension, and adapted to swing into engagement when releasedby the slackening or breaking of either of said cables. l

In testimony whereof I affix my signature in presence of two witnesses.

OLIVER CROSBY.

\Vitnesses:

T. D. MERVVIN, MINNIE L. THAUWALD.

